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# predefine $testlist as a simple string of the set of acceptable char
+acters then
  'index' => sub {
                   $test_char = chr( int( rand 256 ) );
                   if (index($testlist, $test_char) > -1 && length($te
+st_char)==1) {} else {}
                 },

Benchmark: timing 10000000 iterations of comp, exist, index, index2, r
+egex, regex2, regex3...
      comp: 44 wallclock secs (41.64 usr +  0.00 sys = 41.64 CPU) @ 24
+0147.93/s (n=10000000)
     exist: 41 wallclock secs (38.30 usr +  0.00 sys = 38.30 CPU) @ 26
+1117.06/s (n=10000000)
...
     regex: 55 wallclock secs (53.28 usr +  0.00 sys = 53.28 CPU) @ 18
+7684.17/s (n=10000000)
    regex2: 53 wallclock secs (52.34 usr +  0.01 sys = 52.36 CPU) @ 19
+0989.13/s (n=10000000)
    regex3: 53 wallclock secs (50.97 usr +  0.00 sys = 50.97 CPU) @ 19
+6197.69/s (n=10000000)